It features download speeds up to 686 Mbps and upload speeds up to 131 Mbps. As we have covered previously, buying your own cable modem can be a great way to save on yearly rental fees and these SURFboard options are compatible with providers like “Comcast/Xfinity, Cox, Charter, Time Warner, Mediacom, Bright House” and more. Be sure to double check with your ISP for compatibility. This model is the very best selling modem on Amazon and carries a 4+ star rating from nearly 9,500 customers. It ships with a 90-day warranty.